JPH09269746A - Lighting equipment, beacon lights and indicator lights - Google Patents

Abstract

(57) Abstract: Color display by a light emitting diode 3 is enabled, and light color is controlled by an external control signal. A light emitting diode unit (1) for forming a light emitting surface (4) by integrating a plurality of light emitting diodes (3) having RGB emission colors is provided. A communication unit for receiving a control signal from the outside is provided. A control unit for controlling the light emitting diode unit 1 according to the control signal received by the communication unit is provided. The control unit turns on any one of the light emitting diodes 3 of red, green, and blue emission colors, or turns on the light emitting diodes 3 of red, green, and blue emission colors in combination.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device using a light emitting diode as a light source, a marker lamp and an indicator lamp.

[0002]

2. Description of the Related Art Conventionally, for example, as visual aid equipment for airports, it is installed as an embedded type indicator light embedded in the road surface such as a runway or taxiway, or on the ground beside a runway or taxiway. There are terrestrial beacons. In addition, light sources such as incandescent lamps, halogen lamps, and fluorescent lamps are generally used for these marker lamps.

However, when these light sources are used, the power consumption is large and the amount of heat generated is large. In the case of an embedded marker lamp, it cannot be made thin, and a filter for controlling the light rays from the light source is used. Control components such as a reflector and a reflector are required. If on / off control is performed in a short time, blinking does not complete in a short time, life is short, and seismic performance is weak.

Further, as described in Japanese Utility Model Application Laid-Open No. 63-174107, by using a monochromatic light emitting diode as a light source of a ground-based marker lamp, there are problems caused by using a light source such as an incandescent lamp. Has been resolved. In this marker lamp, a plurality of light emitting diodes are linearly arranged along the axial direction on the surface of a substantially cylindrical substrate, and a plurality of rows of light emitting diodes are circumferentially arranged.

[0005]

However, in the conventional marker lamp using the light emitting diode, since the light emitting diodes of a single color are used only in the linear arrangement, the light color cannot be arbitrarily changed. However, when changing the color of light, there is a problem that the unit of the light emitting diode or the entire indicator light must be replaced.

The present invention has been made in view of the above circumstances, and provides a lighting device, a marker lamp, and a display lamp which enable color display by a light emitting diode and can control the light color by a control signal from the outside. With the goal.

[0007]

An illumination device according to claim 1, wherein a light emitting diode unit having a light emitting surface formed by integrating a plurality of light emitting diodes having RGB emission colors; communication for receiving a control signal from the outside. And a control unit for controlling the light emitting diode unit according to the control signal received by the communication unit.

The communication section receives a control signal from the outside, and the control section controls the light emitting diode unit based on the received control signal. The control signal includes blinking control data, color code data, etc. Depending on the color code, either one of the red, green, and blue light emitting diodes is turned on, or the red, green, and blue light is emitted. The LEDs of different colors are combined and turned on.

A lighting device according to a second aspect of the present invention is the lighting device according to the first aspect, wherein the communication section is capable of receiving at least one of a wireless signal and a wired signal.

A control signal from the outside is received by a wireless signal or a wired signal to control the light color.

A lighting device according to a third aspect is the lighting device according to the first or second aspect, in which the light emitting diode unit, the communication section and the control section are integrally molded.

The integration makes it possible to handle as one module.

An illumination device according to a fourth aspect is the illumination device according to any one of the first to third aspects, further comprising a power supply means having a solar cell and a secondary battery charged by the solar cell. Is.

When the power supply by the power supply line is unnecessary or the power supply by the power supply line is interrupted, the power can be supplied from the secondary battery.

A lighting device according to a fifth aspect is the lighting device according to any one of the first to fourth aspects, wherein the light emitting diode unit has a substrate formed in a three-dimensional curved surface, and the light emitting diode is provided on the surface of the substrate. It is a collection of.

The light emitting surface is formed into a three-dimensional curved surface, and the visibility from a plurality of directions is improved.

An illumination device according to claim 6 is the illumination device according to any one of claims 1 to 4, wherein the light emitting diode unit has a flexible substrate having flexibility, and the light emitting diode is provided on a surface of the flexible substrate. It is a collection of.

The flexible substrate can be bent to form the light emitting surface in an arbitrary shape.

The illumination device according to claim 7 is the illumination device according to any one of claims 1 to 6, wherein a part of a light beam emitted from the light emitting diode unit is reflected toward a light emitting surface of the light emitting diode unit. Means are provided.

The brightness of the light emitting surface is increased by reflecting the light beam incident on the reflecting means on the light emitting surface.

The marker lamp according to claim 8 includes a lamp body; a lighting device according to any one of claims 1 to 7 housed in the lamp body; and a light beam emitted from a light emitting diode unit of the lighting device can pass therethrough. And a transparent portion.

In the embedded marker lamp, color display is possible, and the light color can be controlled by a control signal from the outside.

A marker lamp according to claim 9 includes a base; a lighting device according to any one of claims 1 to 7 mounted on the base; a translucent member mounted liquid-tightly on the lighting device. And a gloved body having.

In the ground type indicator lamp, color display is possible, and the light color can be controlled by a control signal from the outside.

According to a tenth aspect of the present invention, the display surface is formed by arranging a plurality of light emitting diode units of the illuminating device according to any one of the first to seventh aspects in a plane.

Using a plurality of light emitting diode units,
Color display is possible, and the display can be controlled by a control signal from the outside.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a first embodiment, FIG. 1 is a sectional view of an embedded marker lamp, FIG. 2 shows a light emitting diode unit, and (a) is a side view of the light emitting diode unit. , (B) is a front view of the light emitting diode unit, FIG.
FIG. 3 is an explanatory diagram illustrating a communication system.

In FIG. 2, reference numeral 1 denotes a light emitting diode unit. The light emitting diode unit 1 has a rectangular substrate 2, and R (red), G (green),
The light emitting diodes 3 having the respective emission colors of B (blue) are arranged and integrated in order, and the light emitting surface 4 is formed by the plurality of light emitting diodes 3.

A power supply section 5, a communication section 6 and a control section 7 are arranged on the back surface side of the substrate 2 of the light emitting diode unit 1, and these are integrally embedded in a molded body 8 formed by molding. .

The power supply unit 5 converts a constant current power supply supplied from the outside into a power supply for lighting the light emitting diode 3 and a power supply for operation of the communication unit 6 and the control unit 7, and supplies them to them.

The communication section 6 has an antenna 6a protruding outside the molded body 8 and receives and processes a wireless control signal from the outside. If necessary, a connector capable of connecting a wire is provided outside the molded body 8 to receive and process a wire control signal. Alternatively, it receives and processes both wireless and wired control signals.
Furthermore, not only the reception of signals but also the operation state may be transmitted.

The control unit 7 controls blinking of each light emitting diode 3 of the light emitting diode unit 1 according to the control signal received by the communication unit 6.

Each light emitting diode unit 1 has a unique address, and the control signal includes address data for calling the light emitting diode unit 1 to be controlled, blinking control data for instructing turning on or off, and light. Includes color code data that indicates a color. Therefore, each light emitting diode unit 1 receives the control signal corresponding to its own address, and turns on or off the light emitting diode 3 of the corresponding light emission color according to the blinking control data and the color code data of the received control signal.

In FIG. 1, reference numeral 11 denotes an embedded aviation beacon light body. This light body 11 is embedded in a road surface such as a runway or taxiway at an airport, and conflicts with each other. It is designed to irradiate light rays in the direction to show the centerline of runways and taxiways.

The lamp body 11 is made of aluminum casting or the like, and is constituted by fixing an upper lamp body 12 and a lower lamp body 13, which are formed in a substantially disc shape, respectively. The lower lamp body 13 is fitted in a concave portion on the upper surface of a base 14 buried in the ground, and is fixed to the base 14 by a bolt or the like.

A space 15 is formed between the upper lamp body 12 and the lower lamp body 13 of the lamp body 11, and a pair of translucent portions 16 that communicate the space portion 15 and the outer surface of the upper lamp body 12 are provided. The openings are formed in the opposite directions. A lens 17 is liquid-tightly attached to each translucent portion 16.

In the space 15 of the lamp body 11, a holder 18 is attached to the lower lamp body 13 facing the inside of each translucent portion 16, and the light emitting diode unit 1 is supported by each holder 18. Each light emitting diode unit 1 is supported with the light emitting surface 4 facing the light transmitting portion 16.

A power supply line (not shown) for supplying a constant current power supply is drawn into the base 14, and when the lamp body 11 is fixed to the base 14, the power supply line and the power supply section 5 of each light emitting diode unit 3 are electrically connected. Connected. Further, a signal line is drawn into the base 14 as needed, and when fixing the lamp body 11 to the base 14, the signal line and the communication unit 6 of each light emitting diode unit 3 are connected.

In FIG. 3, reference numeral 21 denotes a wireless terminal, which transmits a wireless control signal to a plurality of marker lights or the like under the control of the airfield lighting control system. It also enables wireless signals from aircraft and ground services to be received.

From the wireless terminal 21, a control signal including address data, blinking control data and color code data is transmitted.

Next, the operation of the first embodiment will be described.

A constant current power source is supplied to the power source section 5 of the light emitting diode unit 3 of each marker lamp through a power source line, and the operating power source is supplied from the power source section 5 to the communication section 6 and the control section 7. Also, the control unit 7 is in an operating state and stands by for receiving a control signal by wireless or wire.

The wireless terminal 21 wirelessly transmits a control signal associated with address data, lighting control data, color code data, etc. for controlling each marker lamp under the control of a lighting control system or the like.

In the light emitting diode unit 1 of each marker lamp, the communication section 6 receives the control signal transmitted from the wireless terminal 21, and receives the control signal corresponding to its own address. Based on the lighting control data and the color code data of the received control signal, the light emitting diode 3 of the corresponding light emission color is turned on.

When the color code is a single color of red, green and blue, the light emitting diodes 3 of the respective light emitting colors are turned on, and when the color code is other than those, the light emitting diodes 3 of the red, green and blue light emitting colors are turned on. Combine and light. As a result, the light emitting surface 4 of the light emitting diode unit 1 emits light in a light emitting color corresponding to the color code. Light rays emitted from the light emitting surface 4 (light-emitting diode 3 that is turned on) are condensed by the lens 17 and are emitted from the light transmitting portion 16.

Further, when the light emitting diode unit 1 receives the control signal and another color code data is instructed, the light emitting diodes 3 of red, green, and blue light emitting colors are controlled to obtain the corresponding light emitting colors. change.

When the light emitting diode unit 1 receives the control signal and the turn-off control data is instructed, the light emitting diode 3 is turned off.

When a signal system is connected to the light emitting diode unit 1 by wire, it is also possible to receive and process a control signal by wire. Alternatively, it is possible to receive and process both wireless and wired control signals.

When the light emitting diode 3 is used as a light source, the power consumption is small and the amount of heat generated is small,
In the case of an embedded marker light, it becomes possible to make it thinner, and there is no need for control parts such as filters or reflectors to control the light from the light source, and on / off control can be performed in a short time. It has the advantages of being able to complete flashing, having a long life, and having strong earthquake resistance.

Further, by providing the light emitting diode unit 1 in which a plurality of light emitting diodes 3 having RGB emission colors are integrated to form the light emitting surface 4, color display is possible, and the light color can be arbitrarily set by a control signal from the outside. Can be controlled to change. Therefore, it is not necessary to replace a filter or a light emitting diode to change the light color as in the conventional case, and it is possible to effectively provide visual aid to an aircraft.

Further, after the aircraft passes through the outer marker, the light emitting diode unit 1 may receive a radio signal from the aircraft or a radio signal from the ground service to control blinking and emission color.

Next, FIG. 4 shows a second embodiment, and FIG. 4 is an explanatory view in which a power supply means is combined with a ground type indicator light. It should be noted that the same structures as those in the first embodiment are designated by the same reference numerals and the description thereof is omitted.

In FIG. 4, reference numeral 31 is a base body of a ground type indicator light (aviation obstruction light), and the base body 31 is erected on the ground 32 such as a runway side or a taxiway side of an airport. It is designed to irradiate light rays in all directions to show obstacles such as runway sides and taxiway sides.

The base 31 is attached to the ground via the pipe-shaped leg 33.
A plurality of light emitting diode units 1 are arranged in combination on the upper part of the base 31, and the plurality of light emitting diode units 1 are liquid-tightly covered and have a light-transmitting property. The body 34 is attached to the base 31.

The light emitting diode unit 1 includes a power source section 5,
The communication unit 6 and the control unit 7 are separately provided, and the substrate 2 on which the light emitting diodes 3 are integrated is used.
Are arranged in a ring shape toward the outer peripheral surface and are arranged in a plurality of rows in the vertical direction to form a substantially cylindrical shape.

Lighting power is supplied to the marker lamp by the power supply means 35. This power supply means 35 is a solar cell 36.
And a secondary battery 37 charged by the solar battery 36. The solar cell 36 is connected to the ground 32 via the pipe-shaped legs 38.
It is attached to the surface of the panel 39 which is installed upright. The secondary battery 37 is housed at one end of a buried body 40 buried in the ground 32. The leg 38 of the panel 39 is connected to one end of the embedded body 40, and the leg 33 of the base 31 is connected to the other end. The solar cell 36 and the secondary battery 37 are electrically connected by an electric wire 41 wired inside the leg portion 38, and the leg portion 33 and the embedded body 40.
By the electric wire 42 that is wired inside the indicator light side and the secondary battery
37 is electrically connected to. Therefore, solar cells
At 36, the secondary battery 37 is charged, and power is supplied from the secondary battery 37 to the marker light side.

Although not shown, the communication section 6 is disposed on the panel 39, and the antenna 6a of the communication section 6 is provided upright from the panel 39. The control signal received by the communication unit 6 is transmitted to the marker lamp side via the electric wires 41 and 42. Although not shown, a power supply unit 5 and a control unit 7 are arranged on the side of the indicator light, and electric power is supplied to the power supply unit 5 through the electric wire 42. The power supply unit 5 supplies the lighting power source to the light emitting diode unit 1 to the control unit 7. Operating power is supplied.

In the second embodiment, the secondary battery 37 is charged by the solar cell 36, and the electric power accumulated in the secondary battery 37 is supplied to the indicator lamp, whereby the first embodiment is carried out. In the same manner as above, with the light emitting diode unit 1 of the marker lamp,
Color display is possible, and the light color can be arbitrarily changed and controlled by a control signal from the outside.

Therefore, the ground including runways and taxiways
It is not necessary to lay an electric power network at 32, and even if the power supply to the commercial power source is interrupted due to a power outage or the like, operation with the secondary battery 37 is possible.

A power line may be connected to the indicator light so that power can be supplied from either the power line or the secondary battery 37. In this case, power is supplied from the power supply line to the indicator light during normal operation, and power is supplied from the secondary battery 37 to the indicator light during a power failure or the like.

Next, FIG. 5 shows a third embodiment, and FIG. 5 is a perspective view of a part of the ground type indicator lamp. The same reference numerals are used for the same structures as those of the first and second embodiments, and the description thereof will be omitted.

In this embodiment, a substrate 2 having a three-dimensional curved surface, that is, a hemispherical surface is used as the substrate 2 of the light emitting diode unit 1, and a plurality of light emitting diodes 3 having RGB emission colors are provided on the surface of the substrate 2. Are accumulated.

The substrate 2 thus formed in a hemispherical shape
By integrating the light emitting diode 3 in the above, the visibility can be improved from any direction above the horizontal direction of the light emitting diode unit 1.

Next, FIG. 6 shows a fourth embodiment. FIG. 6 shows a flexible substrate of a light emitting diode unit, (a) is a front view of the flexible substrate, and (b) is a curved flexible substrate. FIG. 3C is a perspective view in which the flexible substrate is formed in a cylindrical shape, and FIG. 6D is a perspective view in which the flexible substrate is formed in a substantially triangular tube shape. The first
Through the same structures as those of the third embodiment, the same symbols are used and the description thereof is omitted.

In this embodiment, as shown in FIG. 6A, a flexible substrate 2a having flexibility is used as the substrate 2 of the light emitting diode unit 1, and the surface of the flexible substrate 2a has RGB emission colors. A plurality of light emitting diodes 3 are integrated.

As described above, by using the flexible substrate 2a, as shown in FIG.
2a can be curved to form a curved light emitting surface 4, and
As shown in FIG. 6 (c), the flexible substrate 2a can be bent into a cylindrical shape to form the light emitting surface 4 in the circumferential direction. As shown in FIG. 6 (d), the flexible substrate 2a is formed into a substantially triangular shape. The light emitting surface 4 can be formed in three directions by bending it in a tubular shape.
Therefore, the light emitting surface 4 can be easily formed into an arbitrary shape.

Next, FIG. 7 shows a fifth embodiment, and FIG. 7 is a perspective view of an indicator lamp. The same reference numerals are used for the same structures as those of the first to fourth embodiments, and the description thereof will be omitted.

In this embodiment, the light emitting surfaces 4 of the plurality of light emitting diode units 1 are arranged in a plane on the front surface of the casing 51 of the indicator lamp to form the display surface 4a. In the figure, only the light emitting diode 3 that is turned on is shown.

On the display surface 4a, numbers, characters, pictograms, etc. can be displayed in color by controlling each light emitting diode unit 1.

Next, FIGS. 8 and 9 show a sixth embodiment. FIG. 8 is a sectional view of a transparent member, and FIG. 9 is an enlarged view of a part of the transparent member. The same structures as those of the first to fifth embodiments are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, a light transmitting member 61 is arranged in front of the light emitting diode unit 1, and the light transmitting member 61 transmits the light emitted from the light emitting surface 4 of the light emitting diode unit 1. A light space 62 is provided, the light emitting surface 4 of the light emitting diode unit 1 is disposed on the rear surface of the light transmitting space 62, and a light transmitting port 63 through which light rays are emitted to the front surface of the light transmitting space 62.
Are formed. A reflective surface 64 on the bottom facing the translucent space 62
The reflecting surface 64 is provided with a smiling prism 65 along the front-rear direction, and a reflecting film is formed on the surface of these prisms 65 by vapor deposition or painting, and is emitted from the light emitting surface 4 of the light emitting diode unit 1. A plurality of reflecting surfaces 64a are formed as reflecting means for reflecting the light rays reaching the reflecting surface 64 toward the light emitting surface 4.

As described above, by providing the reflecting surface 64a on the translucent member 61 arranged in front of the light emitting diode unit 1, the light rays emitted from the light emitting surface 4 of the light emitting diode unit 1 and reaching the reflecting surface 64a are received. The brightness of the light emitting surface 4 can be increased by reflecting the light toward the light emitting surface 4.

The reflective surface 64a may be formed on all the inner wall surfaces of the translucent member 61 facing the translucent space 62.

Further, the light transmitting member 61 constitutes the light transmitting portion 16 of the embodiment shown in FIG. 1 or constitutes a hood.

[0076]

According to the lighting device of the first aspect, the RG
By providing a light emitting diode unit in which a plurality of light emitting diodes having the B emission color are integrated to form a light emitting surface, color display by the light emitting diode is possible and the light color can be controlled by a control signal from the outside.

According to the lighting device of the second aspect, in addition to the effect of the lighting device of the first aspect, the communication unit can receive at least one of a wireless signal and a wired signal, and a control signal from the outside. The light color can be controlled by.

According to the lighting device of the third aspect, in addition to the effect of the lighting device of the first or second aspect, since the light emitting diode unit, the communication section and the control section are integrally molded, they are integrated into one module. Can be handled.

According to the lighting device of the fourth aspect, in addition to the effects of the lighting device of the first aspect,
Since the power supply means having a solar cell and a secondary battery charged by this solar cell is provided, power supply by the power supply line can be unnecessary, or the power of the secondary battery can be operated when the power supply by the power supply line is interrupted. .

According to the lighting device of the fifth aspect, in addition to the effect of the lighting device of the first aspect,
Since the light emitting diode unit has a substrate formed on a three-dimensional curved surface and the light emitting diodes are integrated on the surface of this substrate, the visibility can be improved.

According to the lighting device of the sixth aspect, in addition to the effects of the lighting device of the first aspect,
The light emitting diode unit has a flexible substrate having flexibility, and since the light emitting diodes are integrated on the surface of the flexible substrate, the flexible substrate can be bent to easily form the light emitting surface into an arbitrary shape.

According to the lighting device of the seventh aspect, in addition to the effects of the lighting device of the first aspect,
Since the reflecting means for reflecting a part of the light beam emitted from the light emitting diode unit toward the light emitting surface of the light emitting diode unit is provided, the brightness of the light emitting surface can be increased.

According to the marker lamp of claim 8, since the lighting device according to any one of claims 1 to 7 is provided in the lamp body, color display is possible, and the light color can be controlled by a control signal from the outside. .

According to the marker lamp of the ninth aspect, since the illuminating device according to any one of the first aspect to the seventh aspect is arranged in the glove body which is liquid-tightly attached to the base body, color display is possible, and the illuminating device from the outside can be displayed. The light color can be controlled by the control signal.

According to the indicator lamp of the tenth aspect, since the light emitting surfaces of the plurality of light emitting diode units of the illuminating device according to any one of the first to seventh aspects are arranged in a plane to form a display surface, a color display is achieved. The display can be controlled by a control signal from the outside.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embedded marker lamp showing an embodiment of the present invention.

2A and 2B show a light emitting diode unit of the above embodiment, FIG. 2A is a side view of the light emitting diode unit, and FIG. 2B is a front view of the light emitting diode unit.

FIG. 3 is an explanatory diagram illustrating a communication system according to the above embodiment.

FIG. 4 is an explanatory diagram in which a power supply means is combined with a ground type indicator lamp showing a second embodiment of the present invention.

FIG. 5 is a perspective view of a part of a ground type indicator lamp showing a third embodiment of the present invention.

FIG. 6 shows a flexible substrate of a light emitting diode unit according to a fourth embodiment of the present invention, (a) is a front view of the flexible substrate, (b) is a perspective view in which the flexible substrate is curved, and (c) is. FIG. 3D is a perspective view of a flexible substrate formed in a cylindrical shape, and FIG. 3D is a perspective view of the flexible substrate formed in a substantially triangular tube shape.

FIG. 7 is a perspective view of an indicator lamp showing a fifth embodiment of the present invention.

FIG. 8 is a cross-sectional view of a translucent member showing a sixth embodiment of the present invention.

FIG. 9 is an explanatory view showing an enlarged part of the translucent member according to the embodiment.

[Explanation of symbols]

 1 light emitting diode unit 2 substrate 2a flexible substrate 3 light emitting diode 4 light emitting surface 4a display surface 6 communication section 7 control section 11 lamp body 16 translucent section 31 base body 34 globe body 35 power supply means 36 solar cell 37 secondary battery 64a reflection means Reflective surface as

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location H01L 33/00 H01L 33/00 L

Claims (10)

[Claims] 1. A light emitting diode unit in which a plurality of light emitting diodes having RGB emission colors are integrated to form a light emitting surface; a communication unit for receiving a control signal from the outside; and a light emission by the control signal received by the communication unit. A lighting device, comprising: a control unit that controls the diode unit. 2. The lighting device according to claim 1, wherein the communication unit is capable of receiving at least one of a wireless signal and a wired signal. 3. The lighting device according to claim 1, wherein the light emitting diode unit, the communication unit and the control unit are integrally molded. 4. The lighting device according to claim 1, further comprising a power supply means having a solar cell and a secondary battery charged by the solar cell. 5. The lighting device according to claim 1, wherein the light emitting diode unit has a substrate formed on a three-dimensional curved surface, and the light emitting diodes are integrated on a surface of the substrate. 6. The lighting device according to claim 1, wherein the light emitting diode unit has a flexible substrate having flexibility, and the light emitting diodes are integrated on a surface of the flexible substrate. 7. The reflection means for reflecting a part of the light beam emitted from the light emitting diode unit toward the light emitting surface of the light emitting diode unit is provided.
7. The lighting device according to any one of 6 to 6. 8. A lamp body; a lighting device according to claim 1, which is housed in the lamp body; and a translucent portion through which a light beam emitted from a light emitting diode unit of the lighting device can pass. A marker light that is equipped with. 9. A substrate ;; attached to the substrate
7. A marker lamp comprising: the lighting device according to any one of claims 1 to 7; and a light-transmitting globe body that is mounted on a base so as to cover the lighting device in a liquid-tight manner. 10. A display lamp comprising a plurality of light emitting diode units of the lighting device according to claim 1, wherein the light emitting surfaces of the light emitting diode units are arranged in a plane to form a display surface.